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VERY RARE SLIDE RULE - This four sided, special purpose slide rule was used in the fermentation industry. One side of the rule is labeled "Segment Standing". On the back of that slide is the word divisors and sixteen categories from left to right labeled "Ale", "Wine", "M-T", "Malt", "S-F", "G-S", "D-S", "H-S", "G-SS", "W-SS", "FGlafs" etc. Below each category are one or two divisors.In the "Ale" category, for example, are the divisors 282 S and 359 C. On the side labeled "Segment Lying,the reverse side of the slide has the label "spheroid variety" and three scales. The reverse side of a third slide has categories of data and the reverse side of the fourth slide is labeled "Gauge Points" and the categories "Ale", "Wine", "M-T" etc and data with each group.

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